index.py

import streamlit as st
from streamlit_option_menu import option_menu
from chatbotlib import (train_chatbot, demo_chatbot)

# displaying the icon image on streamlit app and set the page config.
st.set_page_config(
    layout="wide",
    page_title="NLP Chatbot Main Page",
    page_icon="💬"
)

# Create sidebar
with st.sidebar:

    # icons are located at bootstrap's website: https://icons.getbootstrap.com
    page_selection = option_menu(
        "NLP Chatbot App",
        ["Train the Chatbot Model", "Demo the Chatbot"],
        icons=["gear", "chat-dots"],
        menu_icon="emoji-smile",
        default_index=0,
        orientation="vertical",
        styles={
            "container": {"padding": "5!important", "background-color": "#fafafa"},
            "icon": {"color": "green", "font-size": "25px"},
            "nav-link": {
                "font-size": "16px",
                "text-align": "left",
                "margin": "0px",
                "--hover-color": "#eee",
            },
            "nav-link-selected": {"background-color": "#002D62"},
        },
    )

# Run the chosen app when selected from the option menu.
match page_selection:

    case "Train the Chatbot Model":
        train_chatbot.run_app()

    case "Demo the Chatbot":
        demo_chatbot.run_app()